powerpc: Update configs to properly set FSL_ELBC

Some parts that have an Enhanced Local Bus Controller weren't
setting CONFIG_FSL_ELBC.  Fix this so we can use this define
properly going forward (currently it's only used if PHYS_64BIT is
set, which meant not all platforms needed to have it set correctly).

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>